robertboardman-gamma created an issue (kamailio/kamailio#4629)
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### Description
I've updated to 6.1.1 from 5.8.7 to take advantage of the new dialog refer
options, but I have been using the rtpengine dtmf-events.
The problem is every time a dtmf event is received the kamailio segfaults
2026-03-05T16:09:23.210394+00:00 kamailio-dev kernel: kamailio[3994]: segfault
at 10 ip 0000748e5f6ff967 sp 00007fff8b35fcb0 error 4 in
rtpengine.so[11967,748e5f6f6000+52000] likely on CPU 1 (core 0, socket 0)
2026-03-05T16:09:23.210422+00:00 kamailio-dev kernel: Code: 5f c1 05 00 4d 29
e2 31 ff c7 85 e8 7d ff ff 04 00 00 00 44 89 95 d8 7d ff ff 48 8d 8d d0 7d ff
ff ba fe 00 00 00 49 8d 77 18 <41> ff 57 10 85 c0 0f 89 27 fb ff ff 41 8b 1e 4c
8b a5 80 7d ff ff
2026-03-05T16:09:23.663516+00:00 kamailio-dev kamailio[3996]: 11(3996)
CRITICAL: <core> [core/pass_fd.c:284]: receive_fd(): EOF on 4
2026-03-05T16:09:23.668949+00:00 kamailio-dev kamailio[3985]: 0(3985) ALERT:
<core> [main.c:824]: handle_sigs(): child process 3994 exited by a signal 11
2026-03-05T16:09:23.669581+00:00 kamailio-dev kamailio[3985]: 0(3985) ALERT:
<core> [main.c:828]: handle_sigs(): core was generated
I have checked to ensure the rtpengine.so is the correct version and it is
showing 6.1.1
### Troubleshooting
I have chnaged the kamailaio.cfg so that the dtmf event is not used and the
system still crashes
#### Reproduction
enable dtmf events from kamailio in 6.1.1 from rtpengine and during a call from
either caller or callee and the system segfaults
#### Debugging Data
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```
(paste your debugging data here)
(gdb) bt full
#0 0x00007b9f52468967 in ?? () from
/usr/lib/x86_64-linux-gnu/kamailio/modules/rtpengine.so
No symbol table info available.
#1 0x00007b9f5247259a in ?? () from
/usr/lib/x86_64-linux-gnu/kamailio/modules/rtpengine.so
No symbol table info available.
#2 0x00005561366ed1c6 in ?? ()
No symbol table info available.
#3 0x00005561366ed177 in ?? ()
No symbol table info available.
#4 0x00005561366ed177 in ?? ()
No symbol table info available.
#5 0x00005561366ed177 in ?? ()
No symbol table info available.
#6 0x00005561366f0362 in init_child ()
No symbol table info available.
#7 0x000055613636cd0e in main_loop ()
No symbol table info available.
#8 0x000055613635cd50 in main ()
No symbol table info available.
#### Log Messages
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#### SIP Traffic
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### Possible Solutions
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provide a pull request with a fix.
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
kamailio -v
version: kamailio 6.1.1 (x86_64/Linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC,
F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, DBG_QM_MALLOC, DBG_F_MALLOC,
DBG_TLSF_MALLOC, USE_FUTEX, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll.
id: unknown
compiled with gcc 13.3.0
* **Operating System**:
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `lsb_release -a` and `uname -a`)
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lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 24.04.2 LTS
Release: 24.04
Codename: noble
uname -a
Linux kamailio-dev 6.8.0-1029-aws #31-Ubuntu SMP Wed Apr 23 18:42:41 UTC 2025
x86_64 x86_64 x86_64 GNU/Linux
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